Results for: Sigma

There are several possible definitions. First, sigma is a letter of the Greek alphabet. Second, sigma is a mathematical operation meaning "sum of the following values". There… are other uses for sigma, including names, other mathematical operations and statistical evaluation. (MORE)

I don't know exactly, but it is probably a very magical rune letter. The topic title confuses me slightly, but in maths sigma is considered a summation sign. Are you con…fusing Sigma, a Greek character, with the Sigel rune, part of the Norse Futhark? In its original language, Sigel meant the Sun, and held great importance to the Norse people. The Sigel rune was used by Nazi Germany, where it was called the Sig rune. Answer I'm going to go out on a limb and guess that you do indeed mean the 'Sig' rune, since as pointed out above, Sigma is a greek character and therefore, not a rune. There are a variety of runes; the primitive alphabets coming from northern Europe, generally carved or painted on stone (no paper at that point in European history). They generally have approximately 22 phonetic characters (which means only one or two, if ANY vowels), and "sig" was the character which phonetically represented s. Its meaning in divination can vary dramatically; ranging from a lightning bolt (which was the germanic interpretation, hence its adoption by the Nazi party) to a snake to a man. Since nobody from that time period still exists, we make our best guesses, but there's no universal 100% interpretation. (MORE)

sigma represents standard deviation. In a normal distribution, +/- 1 sigma from the mean, for instance, corresponds to approximately 67% of the area under the normal distribut…ion. +/- 2 sigma corrresponds to 95% of the area and +/- 3 sigma from the mean corresponds to 99% of the area under a normal distribution. The area that is covered under +/- six sigma from the mean corresponds to nearly 100% -- that is, the part of the area NOT under that +/- 6 sigma is in the 10^-15 range or 1/1,000,000,000,000,000. The six sigma name borrows from this to suggest that the method gives this degree of certainty: that in 999,999,999,999,999 in 1,000,000,000,000,000 cases the result will be predictable. It does nothing, however, to explain how an agricultural process management methodology applies to other fields. (MORE)

its a statistical term for standard diviation. in normal distribution if there are six standard deviations between the process mean and the nearest specification limit, the…n there is a 99.99966% probability that no items will fail to meet specifications . In six sigma 1.5 sigma correction is considered to allow the natural variation present in any process. So when we say that process is sis sigma , it is nactually 4.5 sigma. (MORE)

4.5 Sigma is 1350 defects per million pieces You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion ch…art in the related links section (MORE)